快速检测应用程序是在后台还是前台 [英] Detect if the application in background or foreground in swift

问题描述

有什么办法可以知道我的应用程序是处于后台模式还是前台模式.谢谢

is there any way to know the state of my application if it is in background mode or in foreground . Thanks

推荐答案

[UIApplication sharedApplication].applicationState 将返回应用程序的当前状态，例如:

[UIApplication sharedApplication].applicationState will return current state of applications such as:

• UIApplicationStateActive
• UIApplicationStateInactive
• UIApplicationStateBackground

或者如果您想通过通知访问，请参阅UIApplicationDidBecomeActiveNotification

or if you want to access via notification see UIApplicationDidBecomeActiveNotification

Swift 3+

let state = UIApplication.shared.applicationState
if state == .background || state == .inactive {
    // background
} else if state == .active {
    // foreground
}

switch UIApplication.shared.applicationState {
    case .background, .inactive:
        // background
    case .active:
        // foreground
    default:
        break
}

目标 C

UIApplicationState state = [[UIApplication sharedApplication] applicationState];
if (state == UIApplicationStateBackground || state == UIApplicationStateInactive) {
    // background
} else if (state == UIApplicationStateActive) {
    // foreground
}

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